In the Selected Document Panel, click on the "+" symbol to the left of the page where you would like to insert the additional pages

The Insert Pages window will pop up and display all of the documents currently residing in the Batch Processing folder. Select the appropriate radio button at the top of the screen to tell the system where to add the new pages. Then select the document you would like to add pages from.

All pages of the document you selected will be added to the original document in the location you specified. Rotate, Delete or, Modifypages to your liking.

Close the Paperless Press window when you are finished and your changes will be saved.